testregist.java

简易通用Blog

package org.adam.ajax;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.db.DB;

public class TestRegist extends HttpServlet {

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=gb2312");
		PrintWriter out = response.getWriter();
		String check=request.getParameter("check");
		String value=request.getParameter("value");
		DB db=new DB();
		if(check.equals("username")){
			//System.out.println(check);
			String sql="select * from blog where username='"+value+"'";
			//System.out.println(sql);
			ResultSet rs=db.useAjax(sql);
			try {
				if(rs.next()){
					out.println("用户名已经被注册");
				}else{
					out.println("可以注册");
				}
				db.closed();
			} catch (SQLException e) {
				// TODO 自动生成 catch 块
				e.printStackTrace();
			}
		}else if(check.equals("password")){
			//System.out.println(value);
			if(value.length()<6){
				out.println("密码太短，请重新输入！");
			}else{
				out.println("OK!");
			}
		}else if(check.equals("email")){
			if(value.matches("^[a-zA-Z][a-zA-Z0-9._-]*@([a-zA-Z0-9-_]+\\.)+(com|gov|net|com\\.cn|edu\\.cn)$")){
				out.println("邮箱可以使用!");
			}else{
				out.println("邮箱格式不对！");
			}
		}
	}

}